I put this suggestion here because I find it to be low-priority, and I'd like to get the opinions of the community. So, due to the work of @Vamp1re_Man we've rolled out the party chat plugin--essentially, you can create a "party" of people and have a private group chat. This is controlled with the commands /party and /pc. However, it is only possible at this point in time to have one chat at a time.
I think it'd be really cool to have multiple private group channels implemented. For instance, you could have one for your own group of PVP players, one for close friends on the server, one for your company (if you've built a company in MeepCraft), etc.
What do you all think of this?